SOHC.co.uk Forums > CB350/400

HT Leads on coils

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royhall:
Taken the plunge and ordered the full Boyer kit including the coils off eBay. Strangely I couldn't find it anywhere else.

Will update the 350 Project thread with the details when it arrives.

Thanks guys for the advice.

Will get an email off to DSS in the morning and get a refund on the pattern coils. Will let them know about the resistance issue at the same time.

Don't know if that will change anything as DSS are only a retailer for these, and they are available in many other places.

gtmdriver:
If you buy the Boyer kit you will need their coils too as Boyer specify a minimum coil resistance of 4 ohms.

As I posted earlier you can use the DSS coils with the Boyer system but you need to wire a 1.6 ohm ballast resistor in series with the power (black) lead on each coil.

I posted a few photos about the Boyer system a couple of months ago so if you search under my user name you should find it.

http://www.sohc.co.uk/index.php/topic,8979.msg61594.html#msg61594

royhall:
Yeah found that post, very helpful. I have gone for the full boyer kit with coils as its really one of my existing coils thats failed. Thanks.

royhall:
The new Boyer Bransden kit arrived today. I'm now in need of a little more help.

The coils are not direct replacements, and I assume that although its a £220 kit you have to make all the brackets yourself. Also I've no intentions, after spending 100's of hours restoring a bike to as new, of tie wrapping a digital box to a frame tube. I will have to manufacture a more elegant solution than that. Were not off to a good start.

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Thought I would see what the resistance is across the Boyer coils, and its only 1.4 ohms. What the hell, now I'm confused, I thought it was supposed to be over 4. My existing coils are 5.1 ohms, whats that all about. I assume its to do with some digital wizardry, and the fact the coils are linked in series?

Also are these standard (new) plug caps okay for this application, says something about 5000 ohm suppressed?

Beginning to wish I had just bought one genuine replacement coil instead.

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Any ideas anyone, and does anybody have a photo of the best way to fit this kit to a 350/400 four.

Saves me reinventing the wheel. You may have guessed by now that electrics to me is all magic and conjuring.

Thanks.

gtmdriver:
No.

The Boyer kit that comes with their own coils is different to the kit designed to use the OEM coils.

1.5 ohm is correct for that particular Boyer kit.

The lower resistance allows more current to flow to produce a fat spark but the Boyer kit you have bought is designed to handle that current.

As to mountings I can't help you there. I'm the person who inelegantly ty-wrapped the box to the frame.

Stick with it though. You'll be very pleased with the final result.

Have you tried contacting Boyer as regards the mountings? They are usually very helpful.

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